Mathematics Teacher (1921) Vol. 14, No. 5

THE MATHEMATICS TEACHER VoLUME X IV MAY 1921 NuMBER 5 WHY IT IS IMPOSSIBLE TO TRISECT AN ANGLE OR TO CONSTRUCT A REGULAR POLYGON OF 7 OR 9 SIDES BY RULER AND COl\1PASSES PROFESSOR LEONARD EUGENE DICKSON UNNERSITY OF CHICAGO 1. lnt?od~t ction.-An alert student of geometry who has learned how to bisect any angle is apt t

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